/**
 * Copyright 2019 The TensorFlow Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// Portions Copyright (c) Microsoft Corporation

import AVFoundation
import UIKit

// This Preview File is used for displaying the camera frame

class PreviewView: UIView {
    var previewLayer: AVCaptureVideoPreviewLayer {
        guard let layer = layer as? AVCaptureVideoPreviewLayer else {
            fatalError("Expected `AVCaptureVideoPreviewLayer` type for layer. ")
        }
        return layer
    }

    var session: AVCaptureSession? {
        get {
            return previewLayer.session
        }
        set {
            previewLayer.session = newValue
        }
    }

    override class var layerClass: AnyClass {
        return AVCaptureVideoPreviewLayer.self
    }
}
